Dale Carnegie, no relationship to Andrew, wrote one of the greatest sales in history. It combines storytelling, cognitive science, and persuasion to create the ultimate guide to salesman ship. No library should be without it.

Also highly recommended by Corsair's:

Sponsored by Andrew Carnegie before his death, this Napoleon Hill book is tops among those dedicated to personal success. Read it for the history. Read it for the cognitive science. But definitely - read it!

Francis Bacon's New Method is the intellectual reboot of Aristotle's Organon. Bacon's Method is a detailed methodology that transformed science as we know it. Read this original work to get a better appreciation of Lord Bacon and the history of science.